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Experiment 7: Acid–Base Titration for AP Chemistry

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By — McGraw-Hill Professional
Updated on Apr 25, 2014

For a quick review on stoichiometry, reactions, and periodicity, refer to the following concepts:

Synopsis

The concentration of an acid or a base may be determined by titrating a solution of an unknown concentration with a solution of a known concentration. (See the chapter on Reactions and Periodicity and the chapter on Stoichiometry.)

Equipment

    • analytical balance
    • buret
    • clamp
    • desiccator
    • drying oven
    • Erlenmeyer flask
    • pH meter
    • pipet
    • support stand
    • wash bottle

Experiment 7: Acid–Base Titration

Measurements

  1. the volume of the solution of acid or base using a pipet
  2. the initial reading of the buret
  3. intermediate readings from the buret
  4. the final reading of the buret
  5. the pH of the solution at various times during the reaction

Calculations

The volume added is calculated by taking the difference between measurement 2 and either measurement 3 or 4.

A plot of pH versus the volume added is made. This graph or the difference between measurements 2 and 3 gives the volume of titrant.

The volume of titrant is converted to liters.

The pipeted volume is converted to moles by multiplying the liters of solution by its molarity. The moles of titrant are determined using the mole ratio in the balanced chemical equation for the acid–base reaction. The molarity of the solution is calculated by dividing the moles of titrant by the liters of titrant used.

Comments

It does not matter whether an acid is titrated by a base or vice versa.

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